It rained like mad for about a half-hour.

It's raining cats and dogs.

The rain is teeming down.

When it continues raining cats and dogs for a long while, laundrymen have a hard time doing their work.

Frequently clear and balmy weather deteriorates and it soon rains cats and dogs.

An umbrella is useful in a mild rain, but when it rains cats and dogs an umbrella is of little help.

When it rains, it pours.

When it rains, it pours.

Judging from the present look of the sky, we may have a downpour any moment.

It began to rain cats and dogs.

The rain came down in buckets.

It's raining cats and dogs.

When it rains, it pours.

I have to go even if it rains cats and dogs.

Scattered clouds mean heavy rain.

That day, the rain that had been falling since morning seemed as if it was about to stop around the time that the streetlamps are lit, but as night came it suddenly turned into pouring rain.

It rained hard all day today.

It's raining cats and dogs.

It's raining really hard right now.

When I woke up this morning, it was raining hard.